EP0560314A1 - Monitoring installation with infrared image transmission - Google Patents

Monitoring installation with infrared image transmission Download PDF

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Publication number
EP0560314A1
EP0560314A1 EP93103820A EP93103820A EP0560314A1 EP 0560314 A1 EP0560314 A1 EP 0560314A1 EP 93103820 A EP93103820 A EP 93103820A EP 93103820 A EP93103820 A EP 93103820A EP 0560314 A1 EP0560314 A1 EP 0560314A1
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EP
European Patent Office
Prior art keywords
image
signal
monitoring system
quality
signals
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP93103820A
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German (de)
French (fr)
Other versions
EP0560314B1 (en
Inventor
Rainer Dipl.-Ing. c/o GRUNDIG E.M.V. Rumland
Gerhard c/o GRUNDIG E.M.V. Schlenk
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Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH
Original Assignee
Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L23/00—Control, warning or like safety means along the route or between vehicles or trains
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L15/00—Indicators provided on the vehicle or train for signalling purposes
    • B61L15/0018—Communication with or on the vehicle or train
    • B61L15/0036—Conductor-based, e.g. using CAN-Bus, train-line or optical fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L15/00—Indicators provided on the vehicle or train for signalling purposes
    • B61L15/009—On-board display devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L23/00—Control, warning or like safety means along the route or between vehicles or trains
    • B61L23/04—Control, warning or like safety means along the route or between vehicles or trains for monitoring the mechanical state of the route
    • B61L23/041—Obstacle detection
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
    • G08B13/194—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems
    • G08B13/196—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems using television cameras
    • G08B13/19639—Details of the system layout
    • G08B13/19645—Multiple cameras, each having view on one of a plurality of scenes, e.g. multiple cameras for multi-room surveillance or for tracking an object by view hand-over
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
    • G08B13/194—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems
    • G08B13/196—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems using television cameras
    • G08B13/19678—User interface
    • G08B13/19691—Signalling events for better perception by user, e.g. indicating alarms by making display brighter, adding text, creating a sound
    • G08B13/19693—Signalling events for better perception by user, e.g. indicating alarms by making display brighter, adding text, creating a sound using multiple video sources viewed on a single or compound screen
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division
    • H04N7/0806—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division the signals being two or more video signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
    • H04N7/181—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast for receiving images from a plurality of remote sources

Definitions

  • the invention relates to a monitoring system with one or more television cameras, which are arranged along a route, and one or more monitors for displaying the recorded image signals.
  • Systems of this type are used, for example, to monitor train stations, in particular to monitor the platforms before the train arrives or before and during the train's departure.
  • one or more television cameras are attached for this purpose so that the entire platform is covered. These cameras are used to connect television monitors via wired signal transmission links, on which the recorded images are displayed.
  • the monitors are permanently installed in a location that is selected so that the train driver can see these monitors while the train is staying. Before departure, the train driver can check whether someone is still in the boarding area of the train and at a later point in time whether all doors are closed.
  • Such systems have the disadvantage that the monitors that are installed in the station area are damaged in many cases by vandalism or the image area is sprayed with paint.
  • Another disadvantage of permanently installed monitors is that the train driver can only monitor the platform when the train is stationary. Persons entering a danger zone while the train is leaving cannot be detected.
  • the signal transmission is often carried out by means of a line-free transmission link, as is known, for example, from German Offenlegungsschrift DE-OS 19 47 743.
  • the transmitter which transmits the image signals which are picked up by the television camera or cameras, is arranged in a stationary manner on a path.
  • the corresponding receivers are arranged on the moving vehicle, for example on the train. In these known arrangements, only one image signal is transmitted in each case, but this is not sufficient, for example, for monitoring a station.
  • a television system is known from German published patent application DE 29 34 598 A1, in which the images taken are fed to one or more evaluation devices by means of line-bound transmission from a plurality of television cameras.
  • a multiplexer is connected downstream of the cameras, which switches the video signals of the cameras image-wise in time-division multiplexing to a recording device.
  • an identification signal transmitter arrangement is inserted into the signal path between the cameras and the recording device, which inserts an identification signal identifying the respective camera into the video signals emitted by each camera. On the playback side, these identification signals are evaluated in order to enable the playback of images that were recorded by a single camera.
  • This arrangement also has the disadvantage, first of all, that the image transmission takes place via a line and thus has permanently installed transmission connections. In addition, no measures regarding a good transmission quality are specified.
  • the image transmission takes place in multiplex mode, with an identification signal being added on the transmitter side to at least one of the images, which indicates the assignment of the image signals to the individual cameras, and the receiver signal in the demultiplexer, which contains at least one image memory, the identification signal or the characteristic signals are evaluated and the assignment of the image signals to the respective monitors is determined.
  • the received image signal is checked for quality at the same time, and if the quality is poor, the image signal last received with good quality is displayed on the monitor.
  • the arrangement according to the invention has the advantage that the monitoring of, for example, a platform when entering, while staying and when leaving can be monitored from the perspective of several cameras. Furthermore, the expensive and often damaged monitors are installed on the train, so that they are safe from willful damage.
  • the demultiplexer contains a number of image memories corresponding to the number of transmission channels, into which the image located in a first image memory is transmitted with good quality.
  • the demultiplexer contains the first image memory, which stores the image received by the receiver, and a signal analysis unit, which checks the quality of the incoming image signal and evaluates the transmitted identification signal.
  • An advantageous embodiment of the signal analysis results if the error rate of the synchronous frame is used to assess the image quality. In this way, the effort for assessing the image quality is kept low.
  • the image reproduction on the monitor or monitors is switched off if no image signal of sufficient quality is received within a predetermined period of time between the image signal last received with good quality and the currently received image signal with poor quality.
  • the monitor is automatically switched off a short time after leaving the reception area of the transmitter and, for example, the train driver is not distracted from his route for an unnecessarily long time.
  • the receiver in the vehicle and the image evaluation unit are constantly in the operating state and when an image signal with sufficient image quality is received, the received image signal is automatically displayed on the monitor.
  • the train driver is relieved, for example, by not having to pay attention to the switching on of the monitors.
  • a beep can indicate the presence of an input signal.
  • transmitters are attached along the route, these transmitters being connected to one another by transmission means and all transmitters being supplied with the same signal in common mode.
  • one or more transmitters can already be installed in the entrance area, for example a train station, so that the train driver can already see the situation on the platform there and thus adapt his speed to this situation.
  • transmitters can be installed in the exit area, so that even during departure it can be checked whether all doors are closed or nobody is in the danger area or is entering the danger area.
  • a further advantageous embodiment of the invention results if the television cameras are combined at least partially in pairs and their image signals are mixed in such a way that the first half of an image line is occupied with the image signal of the first camera and the second half with the image signal of the second camera becomes. In this way, the number of monitors can be reduced.
  • FIG. 1 shows the block diagram of a possible embodiment of the invention.
  • This figure contains the television cameras K which are connected to one another with synchronization lines.
  • the cameras K are combined in pairs and connected to signal processing units 1, which contain sectional image devices, among other things.
  • the image signals of the two connected cameras K are mixed with one another in such a way that the first half of a line is written with the image signal from a first camera and the second half with the image signal from a second camera.
  • these sectional image devices 1 are omitted.
  • the television signals are passed to the multiplexer 3, which cyclically passes on the applied television signals to the infrared transmitter 4 in time division multiplex.
  • an identification signal is also attached to at least one of the individual television signals, which indicates an assignment to the recording camera.
  • the signals are emitted in the transmitter 4, which is preferably an infrared transmitter.
  • the signals are received by the receiver 5, which is preferably an infrared receiver.
  • a demultiplexer 6 is connected to the infrared receiver 5, which divides the signals into the same order in which they were sent, this being done by evaluating the identification signals when these identification signals are generated and transmitted in the multiplexer 3.
  • the signals are sent to the monitors M in accordance with this sequence or assignment to the cameras.
  • FIG. 1b shows a possible embodiment of the demultiplexer 6 on the receiver side.
  • the demultiplexer 6 consists of an image memory 61, which stores the image received by the receiver 5. It also contains a signal analysis unit 66 which checks the quality of the incoming image signal and evaluates the transmitted identification signal.
  • a number of image memories 62 corresponding to the number of transmission channels, into which the image in the image memory 61 is transferred with good quality is used for the intermediate storage of the received images with the assignment to a monitor M.
  • the control unit 65 carries out the sequence control. In particular, it uses the multiplexers 63 to add a synchronous frame to the image information read out from the image memories 62. All of the image information with the synchronous frame is sent to the monitors M via the image intensifiers 64, of which only two are shown in the figure.
  • the quality of the incoming synchronous frame or the image content of the input image stored in the image memory 61 is checked in the signal analysis unit 66. If there is insufficient image quality, the image last stored in one of the image memories 62 is sent to the corresponding monitor.
  • 1c shows an embodiment 11, 17 of the infrared transmitter (s) 4.
  • a first transmitter 11 and a second transmitter 17 are shown, the other transmitters being constructed and connected in the same way as transmitter 17 in an arrangement with a plurality of transmitters which emit the same television signal.
  • the transmitter 11 contains a modulator 12, a signal amplifier stage 13 to which the transmission element 15 is connected and an optical fiber transmitter 14, which is also connected to the modulator 12 and feeds its signal into the optical fiber 16.
  • the modulator 12 receives a CVBS signal, which is preferably frequency or pulse modulated.
  • the modulated signal is sent to the signal amplifier stage 13 and to the fiber optic transmitter 14, a preamplifier arrangement may already be contained in the modulator 12, and the signal amplifier stage 13 and the fiber optic transmitter 14 only contain an output amplifier which is adapted to the transmission power required in each case.
  • the receiver 17 receives a signal which has already been processed and which is passed via the optical waveguide 16 to the optical waveguide receiver 19.
  • the optical fiber receiver is connected to the phase shifter 18, which compensates for any differences in transit time.
  • the signal changed in this way is sent to the amplifier stage 20 and transmitted via the transmitting element 21.
  • FIGS. 2a to 2h show a speed diagram for the areas of the entrance of the station, the station itself and the station exit.
  • the diagram shows the situation from the locomotive's point of view, ie the speed will be zero at the end of the station, i.e. the train will stop and accelerate from there.
  • the arrangement of the infrared transmitters S1 to S5 is shown as an example in FIG. 2b and the route sections in which the train driver looks at the route or at the monitor are shown in FIG. 2c.
  • Figures 2d to 2h show the driver's view again with the position of the train.
  • the first transmitter S1 is initially arranged.
  • the train driver can briefly observe the situation on the platform during the braking phase in the station entrance and adjust the entry speed to this situation. Then he can concentrate on the track again. After the train has stopped, the train driver can observe the platform; the corresponding signals will be received from transmitter S2. This is particularly necessary before the time of departure in order to get an overview of whether the doors are closed and nobody is in the danger zone of the train. Even during departure, the train driver can still check the situation on the platform or the doors of the wagons as they pass.
  • the signals are received by transmitter S2 or S3 and transmitters S4 and S5.
  • Such a monitoring system at a train station can, in particular, increase security during the entry of a train and on departure, since monitoring on a monitor is no longer dependent on permanently installed monitors at the station, which can only be viewed while stopping.
  • a moving image is conveniently transmitted, particularly during transmission during the stay and departure of the train, while the situation on the platform can also be captured by a still image in the entrance area.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Human Computer Interaction (AREA)
  • Closed-Circuit Television Systems (AREA)
  • Train Traffic Observation, Control, And Security (AREA)

Abstract

The invention relates to a monitoring system having one or more television cameras which are arranged along a travelling path, and one or more monitors for displaying the video signals picked up. Such systems are used, for example, for monitoring the platforms in railway stations before the arrival of a train and before and during the departure of the train. In known systems, one or more television cameras are mounted for this purpose in such a manner that the entire platform is picked up. The television signals are wirelessly transmitted to the train and the train driver can monitor the platform on his monitor whilst travelling. This is achieved by the signal being transmitted in multiplex mode by means of an infrared transmission link. <IMAGE>

Description

Die Erfindung betrifft eine Überwachungsanlage mit einer oder mehreren Fernsehkameras, die entlang einer Fahrstrecke angeordnet sind, und einem oder mehreren Monitoren zur Darstellung der aufgenommenen Bildsignale.The invention relates to a monitoring system with one or more television cameras, which are arranged along a route, and one or more monitors for displaying the recorded image signals.

Derartige Anlagen werden beispielsweise zur Überwachung von Bahnhöfen, insbesondere zur Überwachung der Bahnsteige vor der Einfahrt des Zuges bzw. vor und während der Abfahrt des Zuges, eingesetzt. Bei bekannten Anlagen werden zu diesem Zweck eine oder mehrere Fernsehkameras so angebracht, daß der gesamte Bahnsteig erfaßt wird. Mit diesen Kameras sind über leitungsgebundene Signalübertragungsstrecken Fernsehmonitore verbunden, auf denen die aufgenommenen Bilder dargestellt werden. Die Monitore sind fest an einem Ort installiert, der so gewählt ist, daß der Zugführer diese Monitore während des Aufenthaltes des Zuges einsehen kann. Vor der Abfahrt kann der Zugführer überprüfen, ob sich noch jemand im Einstiegsbereich des Zuges aufhält und zu einem späteren Zeitpunkt, ob alle Türen geschlossen sind.Systems of this type are used, for example, to monitor train stations, in particular to monitor the platforms before the train arrives or before and during the train's departure. In known systems, one or more television cameras are attached for this purpose so that the entire platform is covered. These cameras are used to connect television monitors via wired signal transmission links, on which the recorded images are displayed. The monitors are permanently installed in a location that is selected so that the train driver can see these monitors while the train is staying. Before departure, the train driver can check whether someone is still in the boarding area of the train and at a later point in time whether all doors are closed.

Derartige Anlagen haben den Nachteil, daß die Monitore, die im Bahnhofsbereich installiert sind, in vielen Fällen durch Vandalismus beschädigt werden oder die Bildfläche mit Farbe übersprüht wird. Ein weiterer Nachteil bei fest installierten Monitoren ergibt sich dadurch, daß der Zugführer nur bei stehendem Zug den Bahnsteig überwachen kann. Personen, die sich während der Abfahrt des Zuges in eine Gefahrenzone begeben, können nicht erfaßt werden. Weiterhin kann es als nachteilig angesehen werden, daß die Übertragungsverbindungen fest installiert sind und somit nicht schnell und flexibel auf geänderte Anforderungen eingegangen werden kann.Such systems have the disadvantage that the monitors that are installed in the station area are damaged in many cases by vandalism or the image area is sprayed with paint. Another disadvantage of permanently installed monitors is that the train driver can only monitor the platform when the train is stationary. Persons entering a danger zone while the train is leaving cannot be detected. Furthermore, it can be regarded as a disadvantage that the transmission connections are permanently installed and thus it is not possible to respond quickly and flexibly to changed requirements.

Aus diesem Grund erfolgt die Signalübertragung häufig mittels einer leitungsungebundenen Übertragungsstrecke, wie es beispielsweise aus der deutschen Offenlegungsschrift DE-OS 19 47 743 bekannt ist.
Bei dieser Übertragungsstrecke wird der Sender, der die Bildsignale, welche von der oder den Fernsehkameras aufgenommen werden, aussendet, stationär an einer Wegstrecke angeordnet. Die entsprechenden Empfänger sind am beweglichen Fahrzeug, beispielsweise am Zug, angeordnet.
Bei diesen bekannten Anordnungen wird jeweils nur ein Bildsignal übertragen, was aber beispielsweise für die Überwachung eines Bahnhofes nicht ausreicht.For this reason, the signal transmission is often carried out by means of a line-free transmission link, as is known, for example, from German Offenlegungsschrift DE-OS 19 47 743.
In this transmission path, the transmitter, which transmits the image signals which are picked up by the television camera or cameras, is arranged in a stationary manner on a path. The corresponding receivers are arranged on the moving vehicle, for example on the train.
In these known arrangements, only one image signal is transmitted in each case, but this is not sufficient, for example, for monitoring a station.

Aus der deutschen Offenlegungsschrift DE 29 34 598 A1 ist in diesem Zusammenhang ein Fernsehsystem bekannt, bei dem mittels leitungsgebundener Übertragung von mehreren Fernsehkameras einem oder mehreren Auswertegeräten die aufgenommenen Bilder zugeführt werden.
Dabei ist den Kameras ein Multiplexer nachgeschaltet, der die Videosignale der Kameras im Zeitmultiplex bildweise auf ein Aufzeichnungsgerät schaltet.
Um bei der Auswertung einen wahlweisen Zugriff auf die Bilder der einzelnen Kameras zu erhalten, wird in den Signalweg zwischen den Kameras und dem Aufzeichnungsgerät eine Kennungssignalgeberanordnung geschaltet, die in die von jeder Kamera abgegebenen Videosignale ein die jeweilige Kamera kennzeichnendes Kennsignal einfügt. Wiedergabeseitig werden diese Kennsignale ausgewertet, um die Wiedergabe von Bildern zu ermöglichen, die von einer einzigen Kamera aufgenommen wurden.
Auch bei dieser Anordnung besteht zunächst der Nachteil, daß die Bildübertragung leitungsgebunden erfolgt und somit fest installierte Übertragungsverbindungen aufweist. Darüberhinaus sind keine Maßnahmen im Hinblick auf eine gute Übertragungsqualität angegeben.In this context, a television system is known from German published patent application DE 29 34 598 A1, in which the images taken are fed to one or more evaluation devices by means of line-bound transmission from a plurality of television cameras.
A multiplexer is connected downstream of the cameras, which switches the video signals of the cameras image-wise in time-division multiplexing to a recording device.
In order to obtain selective access to the images of the individual cameras during the evaluation, an identification signal transmitter arrangement is inserted into the signal path between the cameras and the recording device, which inserts an identification signal identifying the respective camera into the video signals emitted by each camera. On the playback side, these identification signals are evaluated in order to enable the playback of images that were recorded by a single camera.
This arrangement also has the disadvantage, first of all, that the image transmission takes place via a line and thus has permanently installed transmission connections. In addition, no measures regarding a good transmission quality are specified.

Es stellt sich deshalb die Aufgabe eine Überwachungsanlage anzugeben, bei der die Übertragung mehrerer Bildsignale möglich ist, ohne auf eine ausreichend gute Übertragungsqualität verzichten zu müssen.It is therefore the task of specifying a monitoring system in which the transmission of several image signals is possible without having to do without a sufficiently good transmission quality.

Diese Aufgabe wird gemäß der Erfindung gelöst, indem die Bildübertragung im Multiplexbetrieb erfolgt, wobei senderseitig mindestens einem der Bilder ein Kennsignal zugefügt wird, das die Zuordnung der Bildsignale zu den einzelnen Kameras angibt und empfängerseitig im Demultiplexer, der mindestens einen Bildspeicher enthält, das Kennsignal bzw. die Kennsignale ausgewertet werden und die Zuordnung der Bildsignale zu den jeweiligen Monitoren bestimmt. Das empfangene Bildsignal wird gleichzeitig auf seine Qualität hin überprüft und bei mangelhafter Qualität wird das zuletzt mit guter Qualität empfangene Bildsignal auf dem Monitor dargestellt.This object is achieved according to the invention in that the image transmission takes place in multiplex mode, with an identification signal being added on the transmitter side to at least one of the images, which indicates the assignment of the image signals to the individual cameras, and the receiver signal in the demultiplexer, which contains at least one image memory, the identification signal or the characteristic signals are evaluated and the assignment of the image signals to the respective monitors is determined. The received image signal is checked for quality at the same time, and if the quality is poor, the image signal last received with good quality is displayed on the monitor.

Die erfindungsgemäße Anordnung hat den Vorteil, daß die Überwachung beispielsweise eines Bahnsteiges bei der Einfahrt, während des Aufenthaltes und bei der Abfahrt aus der Sicht mehrerer Kameras überwacht werden kann. Weiterhin sind die teuren und oft beschädigten Monitore im Zug installiert, so daß sie vor mutwilligen Beschädigungen sicher sind.The arrangement according to the invention has the advantage that the monitoring of, for example, a platform when entering, while staying and when leaving can be monitored from the perspective of several cameras. Furthermore, the expensive and often damaged monitors are installed on the train, so that they are safe from willful damage.

Eine vorteilhafte Ausgestaltung der Erfindung sieht vor, daß der Demultiplexer eine der Anzahl der Übertragungskanäle entsprechende Anzahl von Bildspeichern, in die das in einem ersten Bildspeicher befindliche Bild bei guter Qualität übertragen wird, enthält. Der Demultiplexer enthält am Eingang den ersten Bildspeicher, der das vom Empfänger erhaltene Bild abspeichert, und eine Signalanlyseeinheit, welche das eingehende Bildsignal auf seine Qualität hin überprüft und das übertragene Kennsignal auswertet.An advantageous embodiment of the invention provides that the demultiplexer contains a number of image memories corresponding to the number of transmission channels, into which the image located in a first image memory is transmitted with good quality. At the input, the demultiplexer contains the first image memory, which stores the image received by the receiver, and a signal analysis unit, which checks the quality of the incoming image signal and evaluates the transmitted identification signal.

Ein vorteilhafte Ausgestaltung der Signalanalyse ergibt sich, wenn die Fehlerrate des Synchronrahmens zur Beurteilung der Bildqualität herangezogen wird. Auf diese Art wird der Aufwand für die Beurteilung der Bildqualität gering gehalten.An advantageous embodiment of the signal analysis results if the error rate of the synchronous frame is used to assess the image quality. In this way, the effort for assessing the image quality is kept low.

In einer vorteilhaften Ausgestaltung der Erfindung wird vorgesehen, daß die Bildwiedergabe auf dem oder den Monitoren abgeschaltet wird, wenn innerhalb einer vorgegebenen Zeitspanne zwischen dem zuletzt mit guter Qualität empfangenen Bildsignal und dem aktuell empfangenen Bildsignal mit schlechter Qualität kein Bildsignal mit ausreichender Qualität empfangen wird.In an advantageous embodiment of the invention it is provided that the image reproduction on the monitor or monitors is switched off if no image signal of sufficient quality is received within a predetermined period of time between the image signal last received with good quality and the currently received image signal with poor quality.

Mit einer derartigen Weiterführung der Erfindung wird erreicht, daß kurze Zeit nach Verlassen des Empfangsbereiches des Senders der Monitor automatisch abgeschaltet wird und beispielsweise der Zugführer nicht unnötig lange Zeit von seiner Fahrstrecke abgelenkt wird.With such a development of the invention it is achieved that the monitor is automatically switched off a short time after leaving the reception area of the transmitter and, for example, the train driver is not distracted from his route for an unnecessarily long time.

In einer weiteren vorteilhaften Ausgestaltung der Erfindung ist der Empfänger im Fahrzeug und die Bildauswerteeinheit ständig in Betriebszustand und bei Empfang eines Bildsignales mit ausreichender Bildqualität wird am Monitor automatisch das empfangene Bildsignal angezeigt. Auch bei dieser Ausführungsform wird beispielsweise der Zugführer entlastet, indem er nicht seine Aufmerksamkeit auf das Einschalten der Monitore richten muß. Ein Signalton kann das Vorliegen eines Eingangssignales anzeigen.In a further advantageous embodiment of the invention, the receiver in the vehicle and the image evaluation unit are constantly in the operating state and when an image signal with sufficient image quality is received, the received image signal is automatically displayed on the monitor. In this embodiment, too, the train driver is relieved, for example, by not having to pay attention to the switching on of the monitors. A beep can indicate the presence of an input signal.

Ein anderer Vorteil ergibt sich, wenn entlang der Fahrstrecke mehrere Sender angebracht sind, wobei diese Sender untereinander durch Übertragungsmittel verbunden sind und allen Sendern im Gleichtaktbetrieb das gleiche Signal zugeführt wird. Auf diese Weise können bereits im Einfahrtsbereich, beispielsweise eines Bahnhofes, ein oder mehrere Sender angebracht seine so daß der Zugführer bereits dort die Situation am Bahnsteig überblicken und somit seine Geschwindigkeit auf diese Situation abstimmen kann. Ebenso können im Ausfahrtsbereich Sender angebracht sein, so daß auch während der Abfahrt noch überprüft werden kann, ob alle Türen geschlossen sind oder sich niemand im Gefahrenbereich aufhält bzw. in den Gefahrenbereich eindringt.Another advantage arises when several transmitters are attached along the route, these transmitters being connected to one another by transmission means and all transmitters being supplied with the same signal in common mode. In this way, one or more transmitters can already be installed in the entrance area, for example a train station, so that the train driver can already see the situation on the platform there and thus adapt his speed to this situation. Likewise, transmitters can be installed in the exit area, so that even during departure it can be checked whether all doors are closed or nobody is in the danger area or is entering the danger area.

Eine weitere vorteilhafte Ausgestaltung der Erfindung ergibt sich, wenn die Fernsehkameras zumindest teilweise paarweise zusammengefaßt werden und ihre Bildsignale in der Weise gemischt werden, daß jeweils die erste Hälfte einer Bildzeile mit dem Bildsignal der ersten Kamera und die zweite Hälfte mit dem Bildsignal der zweiten Kamera belegt wird.
Auf diese Weise läßt sich die Zahl der Monitore verringern.A further advantageous embodiment of the invention results if the television cameras are combined at least partially in pairs and their image signals are mixed in such a way that the first half of an image line is occupied with the image signal of the first camera and the second half with the image signal of the second camera becomes.
In this way, the number of monitors can be reduced.

Weiterhin ist es vorteilhaft, auch im Fahrzeug Sendeelemente und stationär Empfangselemente anzubringen. Auf diese Weise können auch in umgekehrter Richtung vom Fahrzeug aus Signale übertragen werden.Furthermore, it is advantageous to also mount transmitting elements and stationary receiving elements in the vehicle. In this way, signals can also be transmitted from the vehicle in the opposite direction.

Im folgenden wird die Erfindung an Hand der Figuren näher erläutert, wobei hier ohne Beschränkung der Allgemeinheit auf Infrarotübertragung Bezug genommen wird.The invention is explained in more detail below with reference to the figures, reference being made here to infrared transmission without any restriction of generality.

Es zeigen:

  • Figur 1a das Blockschaltbild einer erfindungsgemäßen Überwachungsanlage,
  • Figur 1b eine Ausführungsform des Demultiplexers,
  • Figur 1c das Blockschaltbild zweier miteinander durch Lichtwellenleiter verbundener Infrarotsender, und
  • Figur 2 die Überwachungsanlage am Beispiel eines Bahnhofes.
Show it:
  • FIG. 1a shows the block diagram of a monitoring system according to the invention,
  • FIG. 1b shows an embodiment of the demultiplexer,
  • 1c shows the block diagram of two infrared transmitters connected to one another by optical fibers, and
  • Figure 2 shows the monitoring system using the example of a train station.

In Figur 1 ist das Blockschaltbild einer möglichen Ausführungsform der Erfindung angegeben. Diese Figur enthält die Fernsehkameras K, die mit Synchronisationsleitungen untereinander verbunden sind.
Im dargestellten Fall sind jeweils die Kameras K paarweise zusammengefaßt und mit Signalverarbeitungseinheiten 1, die unter anderem Schnittbildeinrichtungen enthalten, verbunden. In diesen Schnittbildeinrichtungen 1 werden die Bildsignale der beiden angeschlossenen Kameras K miteinander in der Weise gemischt, daß jeweils die erste Hälfte einer Zeile mit dem Bildsignal einer ersten Kamera und die zweite Hälfte mit dem Bildsignal einer zweiten Kamera beschrieben wird. Bei nicht paarweise zusammengefaßten Kameras K entfallen diese Schnittbildeinrichtungen 1.
Im weiteren werden die Fernsehsignale an den Multiplexer 3 gegeben, der im Zeitmultiplex zyklisch die anliegenden Fernsehsignale an den Infrarotsender 4 weitergibt.
Im Multiplexer 3 wird zumindest einem der einzelnen Fernsehsignale auch ein Kennsignal beigefügt, welches eine Zuordnung zur Aufnahmekamera angibt.
FIG. 1 shows the block diagram of a possible embodiment of the invention. This figure contains the television cameras K which are connected to one another with synchronization lines.
In the illustrated case, the cameras K are combined in pairs and connected to signal processing units 1, which contain sectional image devices, among other things. In these sectional image devices 1, the image signals of the two connected cameras K are mixed with one another in such a way that the first half of a line is written with the image signal from a first camera and the second half with the image signal from a second camera. In the case of cameras K not combined in pairs, these sectional image devices 1 are omitted.
Furthermore, the television signals are passed to the multiplexer 3, which cyclically passes on the applied television signals to the infrared transmitter 4 in time division multiplex.
In the multiplexer 3, an identification signal is also attached to at least one of the individual television signals, which indicates an assignment to the recording camera.

Im Sender 4, der vorzugsweise ein Infrarotsender ist, werden die Signale ausgesendet. Vom Empfänger 5, der vorzugsweise ein Infrarotempfänger ist, werden die Signale empfangen. Mit dem Infrarotempfänger 5 ist ein Demultiplexer 6 verbunden, der die Signale in die gleiche Reihenfolge, in der sie gesendet wurden, aufteilt, wobei dies unter Auswertung der Kennsignale erfolgt, wenn diese Kennsignale im Multiplexer 3 erzeugt und gesendet werden. Entsprechend dieser Reihenfolge bzw. Zuordnung zu den Kameras werden die Signale an die Monitore M gegeben.The signals are emitted in the transmitter 4, which is preferably an infrared transmitter. The signals are received by the receiver 5, which is preferably an infrared receiver. A demultiplexer 6 is connected to the infrared receiver 5, which divides the signals into the same order in which they were sent, this being done by evaluating the identification signals when these identification signals are generated and transmitted in the multiplexer 3. The signals are sent to the monitors M in accordance with this sequence or assignment to the cameras.

In Figur 1b ist eine mögliche Ausführungsform des Demultiplexers 6 auf der Empfängerseite dargestellt. Der Demultiplexer 6 besteht aus einem Bildspeicher 61, der das vom Empfänger 5 erhaltene Bild abspeichert. Er enthält weiterhin eine Signalanlyseeinheit 66, welche das eingehende Bildsignal auf seine Qualität hin überprüft und das übertragene Kennsignal auswertet. Eine der Anzahl der Übertragungskanäle entsprechende Anzahl von Bildspeichern 62, in die das im Bildspeicher 61 befindliche Bild bei guter Qualität übertragen wird, dient zur Zwischenspeicherung der empfangenen Bilder unter Zuordnung zu einem Monitor M.
Die Steuereinheit 65 nimmt die Ablaufsteuerung vor. Sie fügt insbesondere über die Multiplexer 63 den aus den Bildspeichern 62 ausgelesenen Bildinformationen einen Synchronrahmen zu. Die gesamte Bildinformation mit dem Synchronrahmen wird über die Bildverstärker 64 an die Monitore M gegeben, von denen in der Figur nur zwei dargestellt sind.FIG. 1b shows a possible embodiment of the demultiplexer 6 on the receiver side. The demultiplexer 6 consists of an image memory 61, which stores the image received by the receiver 5. It also contains a signal analysis unit 66 which checks the quality of the incoming image signal and evaluates the transmitted identification signal. A number of image memories 62, corresponding to the number of transmission channels, into which the image in the image memory 61 is transferred with good quality is used for the intermediate storage of the received images with the assignment to a monitor M.
The control unit 65 carries out the sequence control. In particular, it uses the multiplexers 63 to add a synchronous frame to the image information read out from the image memories 62. All of the image information with the synchronous frame is sent to the monitors M via the image intensifiers 64, of which only two are shown in the figure.

In der Signalanalyseeinheit 66 wird der eingehende Synchronrahmen oder der Bildinhalt des im Bildspeicher 61 abgelegten Eingangsbildes auf seine Qualität hin überprüft. Bei Vorliegen einer nicht ausreichenden Bildqualität wird das zuletzt in einem der Bildspeicher 62 abgelegte Bild an den entsprechenden Monitor gegeben.The quality of the incoming synchronous frame or the image content of the input image stored in the image memory 61 is checked in the signal analysis unit 66. If there is insufficient image quality, the image last stored in one of the image memories 62 is sent to the corresponding monitor.

In Figur 1c ist eine Ausführungsart 11,17 des bzw. der Infrarotsender 4 angegeben. In dieser Figur ist ein erster Sender 11 und ein zweiter Sender 17 dargestellt, wobei in einer Anordnung mit mehreren Sendern, die das gleiche Fernsehsignal abgeben, die weiteren Sender in gleicher Weise wie Sender 17 aufgebaut und angeschlossen werden.1c shows an embodiment 11, 17 of the infrared transmitter (s) 4. In this figure, a first transmitter 11 and a second transmitter 17 are shown, the other transmitters being constructed and connected in the same way as transmitter 17 in an arrangement with a plurality of transmitters which emit the same television signal.

Der Sender 11 enthält einen Modulator 12, eine Signalverstärkerstufe 13, an die das Sendeelement 15 angeschlossen ist und einen Lichtwellenleitersender 14, der ebenfalls mit dem Modulator 12 verbunden ist und sein Signal in den Lichtwellenleiter 16 einspeist.
Der Modulator 12 erhält ein FBAS - Signal, das vorzugsweise frequenz- oder pulsmoduliert wird. Das modulierte Signal wird an die Signalverstärkerstufe 13 und an den Lichtwellenleitersender 14 gegeben, wobei eine Vorverstärkeranordnung bereits im Modulator 12 enthalten sein kann, und die Signalverstärkerstufe 13 und der Lichtwellenleitersender 14 lediglich einen Endverstärker enthalten, der an die jeweils notwendige Sendeleistung angepaßt ist.The transmitter 11 contains a modulator 12, a signal amplifier stage 13 to which the transmission element 15 is connected and an optical fiber transmitter 14, which is also connected to the modulator 12 and feeds its signal into the optical fiber 16.
The modulator 12 receives a CVBS signal, which is preferably frequency or pulse modulated. The modulated signal is sent to the signal amplifier stage 13 and to the fiber optic transmitter 14, a preamplifier arrangement may already be contained in the modulator 12, and the signal amplifier stage 13 and the fiber optic transmitter 14 only contain an output amplifier which is adapted to the transmission power required in each case.

Der Empfänger 17 erhält ein bereits aufgearbeitetes Signal, das über den Lichtwellenleiter 16 an den Lichtwellenleiterempfänger 19 geführt wird. Der Lichtwellenleiterempfänger ist mit dem Phasenschieber 18 verbunden, der eventuelle Laufzeitunterschiede ausgleicht. Das so veränderte Signal wird an die Verstärkerstufe 20 gegeben und über das Sendeelement 21 ausgesendet.The receiver 17 receives a signal which has already been processed and which is passed via the optical waveguide 16 to the optical waveguide receiver 19. The optical fiber receiver is connected to the phase shifter 18, which compensates for any differences in transit time. The signal changed in this way is sent to the amplifier stage 20 and transmitted via the transmitting element 21.

In den Figuren 2a bis 2h wird der Einsatz einer erfindungsgemäßen Überwachungsanlage am Beispiel eines Bahnhofes erläutert.
Figur 2a zeigt ein Geschwindigkeitsdiagramm für die Bereiche der Einfahrt des Bahnhofes, des Bahnhofes selbst und der Bahnhofsausfahrt. Das Diagramm zeigt die Situation aus der Sicht der Lokomotive, d.h. am Bahnhofsende wird die Geschwindigkeit Null sein, der Zug also stehen und von dort wieder beschleunigen.
In der Figur 2b ist die Anordnung der Infrarotsender S1 bis S5 beispielhaft dargestellt und in Figur 2c sind die Streckenabschnitte dargestellt, in denen der Zugführer auf die Strecke bzw. auf den Monitor sieht.
Die Figuren 2d bis 2h zeigen die Fahrersicht noch einmal mit Angabe der Stellung des Zuges.
Bei der Einfahrt in den Bahnhof ist zunächst der erste Sender S1 angeordnet. Auf diese Weise kann der Zugführer bereits während der Abbremsphase in der Bahnhofseinfahrt kurzzeitig die Situation am Bahnsteig beobachten und die Einfahrtsgeschwindigkeit dieser Situation anpassen.
Danach kann er sich wieder auf die Strecke konzentrieren. Nachdem der Zug angehalten hat, kann der Zugführer den Bahnsteig beobachten; die entsprechenden Signale werden vom Sender S2 erhalten. Dies ist insbesondere vor dem Zeitpunkt der Abfahrt notwendig, um sich einen Überblick zu verschaffen, ob die Türen geschlossen sind und sich niemand mehr im Gefahrenbereich des Zuges aufhält. Auch während der Abfahrt, kann der Zugführer noch die Situation am Bahnsteig, bzw. im Vorbeifahren die Türen der Waggons überprüfen. Die Signale werden hierbei vom Sender S2 bzw. S3 und den Sendern S4 und S5 erhalten.The use of a monitoring system according to the invention is explained using the example of a train station in FIGS. 2a to 2h.
Figure 2a shows a speed diagram for the areas of the entrance of the station, the station itself and the station exit. The diagram shows the situation from the locomotive's point of view, ie the speed will be zero at the end of the station, i.e. the train will stop and accelerate from there.
The arrangement of the infrared transmitters S1 to S5 is shown as an example in FIG. 2b and the route sections in which the train driver looks at the route or at the monitor are shown in FIG. 2c.
Figures 2d to 2h show the driver's view again with the position of the train.
When entering the station, the first transmitter S1 is initially arranged. In this way, the train driver can briefly observe the situation on the platform during the braking phase in the station entrance and adjust the entry speed to this situation.
Then he can concentrate on the track again. After the train has stopped, the train driver can observe the platform; the corresponding signals will be received from transmitter S2. This is particularly necessary before the time of departure in order to get an overview of whether the doors are closed and nobody is in the danger zone of the train. Even during departure, the train driver can still check the situation on the platform or the doors of the wagons as they pass. The signals are received by transmitter S2 or S3 and transmitters S4 and S5.

Durch eine derartige Überwachungsanlage an einem Bahnhof kann insbesondere die Sicherheit während des Einfahrens eines Zuges und bei der Abfahrt erhöht werden, da die Überwachung auf Monitor nicht mehr von fest installierten Monitoren am Bahnhof, die nur während des Anhaltens betrachtet werden können, abhängig ist.Such a monitoring system at a train station can, in particular, increase security during the entry of a train and on departure, since monitoring on a monitor is no longer dependent on permanently installed monitors at the station, which can only be viewed while stopping.

Hierbei kann es vorteilhaft sein, entsprechend der Anforderung an die Überwachung ein Standbild oder ein Bewegtbild zu übertragen. Insbesondere bei der Übertragung während des Aufenthaltes und der Abfahrt des Zuges wird günstigerweise ein Bewegtbild übertragen, während im Einfahrtsbereich die Situation am Bahnsteig auch durch ein Standbild erfasst werden kann.It can be advantageous here to transmit a still image or a moving image in accordance with the monitoring requirements. A moving image is conveniently transmitted, particularly during transmission during the stay and departure of the train, while the situation on the platform can also be captured by a still image in the entrance area.

Claims (8)

Überwachungsanlage mit einer oder mehrerer Fernsehkameras(K), mit einer Signalverarbeitungseinheit (1) zur Verarbeitung der von der oder den Fernsehkameras (K) aufgenommenen Bildsignalen, mit einer leitungsungebundenen Bildübertragungsstrecke, bei der die Sendeelemente (4) stationär und die Empfangselemente (5) beweglich in einem Fahrzeug angebracht sind und ein oder mehreren Monitoren (M) zur Anzeige der aufgenommenen Bilder, dadurch gekennzeichnet, daß - die Bildübertragung im Multiplexbetrieb erfolgt, - wobei senderseitig in einem Multiplexer (3) einem oder mehreren Bildern ein Kennsignal zugefügt wird, das die Zuordnung der Bildsignale zu einer Kamera angibt, und - empfängerseitig im Demultiplexer (6) die Kennsignale für die Zuordnung der Bildsignale zu den Monitoren ausgewertet werden, - das empfangene Bildsignal ständig auf seine Qualität hin überprüft wird und bei mangelhafter Qualität das zuletzt mit guter Qualität empfangene Bildsignal auf dem Monitor (M) dargestellt wird. Monitoring system with one or more television cameras (K), with a signal processing unit (1) for processing the image signals recorded by the television camera or cameras (K), with a line-free image transmission link in which the transmitting elements (4) are stationary and the receiving elements (5) are movable are mounted in a vehicle and one or more monitors (M) for displaying the recorded images, characterized in that - the image transmission takes place in multiplex mode, - In the multiplexer (3) a identification signal is added on the transmitter side, which indicates the assignment of the image signals to a camera, and - The identification signals for the assignment of the image signals to the monitors are evaluated on the receiver side in the demultiplexer (6), - The received image signal is constantly checked for its quality and, if the quality is poor, the image signal last received with good quality is displayed on the monitor (M). Überwachungsanlage nach Anspruch 1, dadurch gekennzeichnet, daß
der Demultiplexer (6) - einen Bildspeicher (61) enthält, der das vom Empfänger (5) erhaltene Bild abspeichert, - eine Signalanlyseeinheit (66) enthält, welche das eingehende Bildsignal auf seine Qualität hin überprüft und das übertragene Kennsignal auswertet, - eine der Anzahl der Übertragungskanäle entsprechende Anzahl von Bildspeichern (62) enthält, in die das im Bildspeicher (61) befindliche Bild bei guter Qualität übertragen wird. Monitoring system according to claim 1, characterized in that
the demultiplexer (6) an image memory (61) which stores the image received by the receiver (5), contains a signal analysis unit (66) which checks the quality of the incoming image signal and evaluates the transmitted identification signal, - Contains a number of image memories (62) corresponding to the number of transmission channels, into which the image in the image memory (61) is transferred with good quality. Überwachungsanlage nach Anspruch 1 oder Anspruch 2, dadurch gekennzeichnet, daß
in der Signalanalyseeinheit (66) die Fehlerrate des Synchronrahmens zur Beurteilung der Bildqualität ausgewertet wird.Monitoring system according to claim 1 or claim 2, characterized in that
the error rate of the synchronous frame for evaluating the image quality is evaluated in the signal analysis unit (66). Überwachungsanlage nach einem oder mehreren der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß
die Anzeige auf dem oder den Monitoren (M) abgeschaltet wird, wenn innerhalb einer vorgebbaren Zeitspanne nach dem zuletzt mit guter Qualität empfangenen Bildsignal kein Bildsignal mit ausreichender Qualität empfangen wird.Monitoring system according to one or more of claims 1 to 3, characterized in that
the display on the monitor or monitors (M) is switched off if no image signal of sufficient quality is received within a predeterminable period of time after the image signal last received with good quality. Überwachungsanlage nach einem oder mehreren der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß - entlang der Fahrstrecke mehrere Infrarotsender (4,11,17) angebracht sind, - diese Sender (4,11,17) untereinander durch leitungsgebundene Übertragungsmittel verbunden sind, und - allen Sendern (4,11,17)das gleiche Bildsignal zugeführt wird. Monitoring system according to one or more of claims 1 to 4, characterized in that - several infrared transmitters (4, 11, 17) are attached along the route, - These transmitters (4, 11, 17) are connected to one another by wired transmission means, and - The same image signal is supplied to all transmitters (4, 11, 17). Überwachungsanlage nach einem oder mehreren der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß
die Fernsehkameras (K) zumindest teilweise paarweise zusammengefaßt werden und ihre Bildsignale so gemischt werden, daß jeweils die erste Hälfte einer Bildzeile mit dem Bildsignal der ersten Kamera und die zweite Hälfte mit dem Bildsignal der zweiten Kamera belegt wird.Monitoring system according to one or more of claims 1 to 5, characterized in that
the television cameras (K) are combined at least partially in pairs and their image signals are mixed such that the first half of an image line is occupied with the image signal from the first camera and the second half with the image signal from the second camera. Überwachungsanlage nach einem oder mehreren der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß
je nach Anforderung Standbilder oder Bewegtbilder übertragen werden.Monitoring system according to one or more of claims 1 to 6, characterized in that
Depending on the requirements, still images or moving images can be transmitted. Überwachungsanlage nach einem oder mehreren der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß
Sendeelemente beweglich an einem Fahrzeug und Empfangselemente stationär angebracht sind, um auch Signale vom Fahrzeug aus übertragen zu können.Monitoring system according to one or more of claims 1 to 7, characterized in that
Transmitter elements are movably attached to a vehicle and receiving elements are stationary so that signals can also be transmitted from the vehicle.
EP93103820A 1992-03-11 1993-03-10 Monitoring installation with infrared image transmission Expired - Lifetime EP0560314B1 (en)

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CN100348042C (en) * 2003-07-22 2007-11-07 日产自动车株式会社 Display system for vehicle and method of controlling the same
EP1759954A1 (en) * 2005-09-01 2007-03-07 Alcatel Method and system for monitoring a public transport vehicle
WO2007025862A1 (en) * 2005-09-01 2007-03-08 Alcatel Lucent Monitoring method and system for a public transport vehicle
WO2009135840A1 (en) * 2008-05-09 2009-11-12 Siemens Aktiengesellschaft Route monitoring system for a vehicle and method for operating the same
FR2963603A1 (en) * 2010-08-03 2012-02-10 Eri Display device for monitoring ascent or descent of passengers on train or metro platform, has cabinet whose front wall forming door is mounted to pivot around axis, and video monitors mounted to pivot around axis similar to door

Also Published As

Publication number Publication date
EP0560314B1 (en) 1996-12-27
DE4207688C1 (en) 1993-06-03
DE59304848D1 (en) 1997-02-06

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